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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]            
Dividends declared per common share (in dollars per share) $ 0.1518 $ 0.1518 $ 0.1320 $ 0.1320 $ 0.3036 $ 0.2640